- tality. We had so often heard it said that
a rat's tail resembled a pink worm and detracted from the beauty of the animal, that at last we selected one from our menagerie, and cut off the much-abused appendage. The little rat bore the operation well, grew up bravely, and became a master rat, with a fine pair of moustaches; but in spite of being lightened of the weight of his caudal extremity, he was always less agile than his companions, was wary in gymnastic exercises, and frequently experienced a tumble. When the troop ran up the staircase, he invariably came last; and he always had the air of an acrobat who is testing his tight-rope and is not quite sure of his balance. This experiment convinced us of the usefulness of a tail to rats. It holds them in equilibrium as they run along cornices and narrow projections. When they swiftly turn to right or left the tail turns too, serving as a counter-
